Thompson, M. J.2017-02-142017-02-141920-05Thompson, M.J. Forced vs. delayed systems of clearing stump land: supplement to Bulletin 163. 1920. Saint Paul, Minn.: University of Minnesota. Agricultural Experiment Station. Bulletin 189, page 1-24https://hdl.handle.net/11299/184124This archival publication may not reflect current scientific knowledge or recommendations. Current information available from University of Minnesota Agricultural Experiment Station: http://www.maes.umn.edu/enNewsletter or Bulletin